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Date: Fri, 16 Feb 2018 06:32:03 +0100
From: mhx AT iae DOT nl
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] (Off-topic) Question wrt driving HV piezo transducer
In-Reply-To: <da435a2d-0bd0-f6d7-7d9a-05394665621c@linetec.nl>
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On 2018-02-15 23:02, Richard Rasker (rasker AT linetec DOT nl) [via 
geda-user AT delorie DOT com] wrote:
[..]
> However, this afternoon, the product dealer was kind enough to send me
> the schematic of a 500 Vpp development driver kit, featuring a
> center-tapped symmetrical push-pull transformer(*) circuit with two
> FDD16AN08 MOSFETs, each with a 1 uF capacitor across drain-source.
> These big DS-caps seem rather weird already.
[..]

This could be a push-pull parallel-resonant parallel-load type 
configuration.
It should be tuned to exactly the resonance of the effective L+C and 
will have
a Vds of about 3.14159 times the supply voltage. The transistors turn on 
when
their Vds tries to go negative (automatically). The 1uF across drain 
source does
not sound familiar but is equivalent to a single cap between the two 
sources,
i.e. in parallel to the transformed transducer (as it should be).
Theoretically, this is the dual circuit to the HB series resonance 
series load
one.

> Richard